:root {
  --bg: #121316;
  --surface: #181a1f;
  --surface-alt: #1e2128;
  --border: #2a2e38;
  --text: #e6e4df;
  --text-muted: #9ca0ab;
  --accent: #c8a96e;
  --accent-soft: rgba(200, 169, 110, 0.14);
  --font-serif: "Georgia", "Times New Roman", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-serif);
  line-height: 1.78;
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(18, 19, 22, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 20px;
  flex-wrap: wrap;
  padding-top: 12px;
  padding-bottom: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.sigil {
  font-family: var(--font-sans);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.85rem;
}

.brand-subtitle {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--text-muted);
}

.top-nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.top-nav a {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.top-nav a:hover {
  color: var(--accent);
}

.main-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  padding-top: 56px;
  padding-bottom: 80px;
}

@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
}

.treatise-hero {
  padding-bottom: 36px;
  margin-bottom: 44px;
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  color: var(--accent);
  margin-bottom: 14px;
}

h1 {
  font-size: 2.5rem;
  line-height: 1.22;
  font-weight: 400;
  margin-bottom: 20px;
  color: #f4f2ed;
}

.lead {
  font-size: 1.18rem;
  color: var(--text-muted);
  margin-bottom: 22px;
}

.meta-bar {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.chapter {
  margin-bottom: 52px;
}

.chapter-num {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 8px;
}

h2 {
  font-size: 1.65rem;
  font-weight: 400;
  margin-bottom: 18px;
  color: #f0eee9;
}

p {
  margin-bottom: 18px;
  text-align: justify;
}

blockquote {
  margin: 26px 0;
  padding: 18px 24px;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  font-style: italic;
  color: #dcd9d0;
  border-radius: 0 6px 6px 0;
}

.theses {
  margin: 20px 0 20px 24px;
}

.theses li {
  margin-bottom: 12px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
}

.card h3 {
  font-size: 1.1rem;
  margin: 10px 0 8px;
  font-weight: 600;
}

.card p {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 0;
  text-align: left;
}

.badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 4px;
}

.badge-live {
  background: var(--accent-soft);
  color: var(--accent);
}

.badge-prep {
  background: var(--surface-alt);
  color: var(--text-muted);
}

.sidebar-box {
  position: sticky;
  top: 96px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

.sidebar-box h3 {
  font-size: 1rem;
  margin-bottom: 10px;
  color: var(--accent);
}

.sidebar-box p {
  text-align: left;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.sidebar-box hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 16px 0;
}

.spec-list dt {
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-top: 10px;
}

.spec-list dd {
  color: var(--text);
  font-weight: 500;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  font-family: var(--font-sans);
  font-size: 0.84rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}